If all of those strange plot points would have been in an exciting more I think that Superman 3 would be coming out this summer.

And where is Spider-Man 4 ? A movie with stranger plot points (Spider-Man 3) which many considered as exciting when it was released and made ton of money ?

Lets face some facts, both Singer and Sam Raimi are a fan of Donner Superman movies (So is Nolan.) In fact the first Spider-Man movie has many parallels with STM, second Spider-Man movie follows Superman 2 in many areas, third Spider-Man movie is close in many respects to Superman 3.

Superman as a Character is often compared to Moses and Jesus both in Comics and Movies, as Singer was making SR a part of existing Donnerverse Superman, it was to be expected.

I would say that Spider-Man character was created by taking inspiration form Superman.